[原創].netcore通過PetaPoco操作mysql、sqlserver等

一、引入PetaPoco.NetCore，PetaPoco.NetCore 是基於PetaPoco的輕量ORM，支持.netframework和.netcore，支持單個實體對象映射，也支持多實體對象映射，NetCore未需指定驅動連接，其它API一致。

github地址：https://github.com/qingask/PetaPoco.NetCore

nugut地址：https://www.nuget.org/packages/PetaPoco.NetCore

通過nuget安裝 PM>Install-Package PetaPoco.NetCore 

 

二、.netcore配置 
在project.json增加相應.netcore版本的數據庫驅動引用，這里mysql的驅動使用Pomelo.Data.MySql，mysql官方的netcore版本驅動兼容性太差，坑太多，等完善后可替換為官方的myssql core驅動
"dependencies": { 
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final", 
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final", 
"Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc2-final", 
"Microsoft.NETCore.App": { 
"version": "1.0.0-rc2-3002702", 
"type": "platform" 
}, 
"Pomelo.Data.MySql": "1.0.0", 
"System.Text.Encoding.CodePages": "4.0.1" 
} 

三、使用PetaPoco.NetCore

1.測試sql

測試sql
CREATE TABLE blogs (
BlogId int(11) NOT NULL PRIMARY KEY,
Url varchar(1000) DEFAULT NULL
);

create table post(
id int,
title varchar(32),
author int
);

drop table author;
create table author(
id int,
name varchar(32)
);
INSERT into blogs values(1,'test1'); INSERT into blogs values(2,'test2');

INSERT into author value(1,'作者1'); INSERT into author value(2,'作者2');

INSERT into post values(1,'book1',1); INSERT into post values(2,'book2',1); INSERT into post values(3,'book3',2); INSERT into post values(4,'book4',2);

　　

2.使用PetaPoco.NetCore

           MySqlConnection connection = new MySqlConnection(""server=localhost;database=test;uid=root;password=123456;charset=utf8;SslMode=None"");
            var db = new Database(connection);
            //實體測試
            Blog blog = new Blog() { BlogId = 3, Url = "test3" };
            //保存
            var result = db.Insert(blog);
              //編輯
            blog.Url = "test333";
            result = db.Update(blog);
               //刪除
            result = db.Delete(blog);

            //sql測試
            var sql1 = Sql.Builder.Append("insert into blogs values(4,'test4')");
            result = db.Execute(sql1);
            var sql2 = Sql.Builder.Append("update blogs set Url='test444' where BlogId=4");
            result = db.Execute(sql2);

            //查詢
            var model2 = db.SingleOrDefault<Blog>(1);
              //列表
            var list = db.Query<Blog>(Sql.Builder.Append("select * from blogs")).ToList();
              //分頁
            var list2 = db.Page<Blog>(1, 2, Sql.Builder.Append("select * from blogs"));
              //查詢
            var sql3 = Sql.Builder.Append("select * from blogs where BlogId=4");
            var model1 = db.Query<Blog>(sql3).FirstOrDefault();
            var model3 = db.FirstOrDefault<Blog>(sql3);

            //返回多個結果測試
            result = db.Fetch<post, author, post>(
            (p, a) =>
            {
                p.author_obj = a;
                return p;
            },
            @"SELECT * FROM post LEFT JOIN author ON post.author = author.id ORDER BY post.id");

            using (var multi = db.QueryMultiple("select * from post"))
            {
                result = multi.Read<post>().ToList();
            }
            using (var multi = db.QueryMultiple(@"SELECT * FROM post LEFT JOIN author ON post.author = author.id ORDER BY post.id"))
            {
                result = multi.Read<post, author, post>((p, a) => { p.author_obj = a; return p; }).ToList();
            }
            using (var multi = db.QueryMultiple("select * from post;select * from author;"))
            {
                var p = multi.Read<post>().First();
                var a = multi.Read<author>().First();
            }